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采用Williams—Mead磁场模式,考虑当行星际磁场存在南向分量时的磁层扰动情况,计算了一组同步卫星所在位置太阳质子截止刚度随地方时的变化。计算结果表明,当考虑行星际磁场存在5γ南向分量时,截止刚度值显著降低。午夜西方截止刚度极小值由原来的3.1兆电子伏降至1.9兆电子伏,中午西方截止刚度极大值由原来的22.1兆电子伏降至16.6兆电子伏。与同步高度太阳质子的观测结果更加接近。
By using the Williams-Mead model, considering the disturbance of the magnetosphere when there exists a southward component of the interplanetary magnetic field, the change of the solar proton cut-off stiffness of a group of geostationary satellites with the local time is calculated. The calculated results show that the cut-off stiffness decreases significantly when considering the 5γ south component of the interplanetary magnetic field. At midnight, the minimum Western Cut-Off stiffness dropped from 3.1 trillion electron volts to 1.9 trillion electron volts. The maximum westbound cut-off stiffness dropped from 22.1 trillion volts to 16.6 trillion volts at midday. It is closer to the observations of synchronized high-altitude protons.